簡單例子演示 ThreadLocal 類的使用方法

fwe3 9年前發布 | 1K 次閱讀 Java 2013暑期 微軟實習筆試題目 

/* Demonstrate use of ThreadLocal /
public class ThreadLocalDemo extends Thread {


/* A serial number for clients /
  private static int clientNum = 0;


/* This ThreadLocal holds the Client reference for each Thread /
  private ThreadLocal myClient = new ThreadLocal() {
    // The initialValue() method is called magically when you call get().
    protected synchronized Object initialValue() {
      return new Client(clientNum++);
    }
  };


public void run() {
    System.out.println("Thread " + Thread.currentThread().getName() +
      " has client " + myClient.get());
  }


public static void main(String[] args) {
    Thread t1 = new ThreadLocalDemo();
    Thread t2 = new ThreadLocalDemo();
    t1.start();
    t2.start();
  }


/* Simple data class, in real life clients would have more fields! /
  private class Client {



private int clNum;

Client(int n) {
  clNum = n;
}

public String toString() {
  return "Client[" + clNum + "]";
}



}
}</pre>
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